<template>
  <div id="app">
    <div class="box">
      <div class="left"></div>
      <div class="mid"></div>
      <div class="right"></div>
    </div>
  </div>
</template>

<script>
import HelloWorld from './components/HelloWorld.vue'

export default {
  name: 'App',
  components: {
    HelloWorld
  }
}
</script>

<style lang="less" scoped>
#app{
.box{
display: flex;
width: 100%;
height: 100vh;
flex: 1;
background-color: skyblue;
  
}
.left{
flex: 1;
background-color: skyblue;

}
.mid{
flex: 1;
background-color: blue;

}
.right{
flex: 1;
background: #000;
}
}
</style>
